of wilmington



DAKLEY M.

BKSHOP, 0F WILMINGTON, DELAWARE, ASSIGNOR T0 E. I. DU PONT DE NEMOUILS 5: COMPANY, OF WILMINGTOISF, DELAWARE, A CORPORATION 01 DELA- WARE.

canons nnmva'rrvns or N-DIHYDROJ3,1',2'-ANTHRAQUINONE-AZINE AND success or muse same Ho Drawing.

This invention relates to new poly-chloro-derivatives of N-dihydro-1,2,1',2'-anthraquinone-azine having greener shades and greater fastness to chlorine than the chlorinated 'azine-derivatives heretofore produced; the invention also pertains to processes of makin these new chloro-derivatives.

' Various methods are given in theliterature for the production of halogen derivatives of the above mentioned azine. the most commonly used method consisting in the treatmentof the azine with aqua regia. Another method consists in treating: the azine with antimony pentachloride in the presence of nitrohenzene.

l have now discovered that chloro-deriva tires possessing a greener shade of blue and a substantially greater faslness to chlorine.

bleach are obtainable by ghlorinating the N dil'iydro 1,2,1,2" anthraquinone azine with gaseous chlorine in the presence of acetic acid or nitrobenzene or a. mixture of the two, the chlorination being carried out preferably at a temperature above 40 C. By following this new procedure the chlorination may be effected quickly and satisfactorily.

The acetic acid which is to be used as a suspension medium may be glacial or cm'il'ain a little water, and may be used alone or in admixture with inc-rt organicliquids and especially nitrobenzene. The chloro-derivatives showing the best resistance to bleach of any produced have been made with scciic acio alone as the suspension medium.

ilhe. new process will be illustrated in greater detail by the following examples:

l. Acetic acid -One part of N-dihydroi.2.l..2'-anthraquinone-azine is suspended in fifteen parts if glacial acetic acid (either fresh or previously used acid may be used) and a stream. of dry chlorine is passed into the suspension until the desired shade of color is produced, which can be shown by sampling and dyetesting. The charge 15 then filtered, washed free from acid with hot water, and the recovered dyestuff is dried and finished in the usual manner.

Satisfactory results have been obtained by carrying out the chlorination at temperatures from to'115 (1 but the best results by this have been secured at a temper- Application filed June 24, 1922. Serial No. 570,727.

ature of 90 C. Four typical samples produced showed a. chlorine content of 13.47, 13.54, 13.54, and 13.69 per cent respectively. The theory for a dichlor-derivative is 13.89 per cent.

II. Nit1'0benzenc.()ne part of N-dihydro 1,2,12 anthraquinone azine is suspended in fifteen parts of fresh nitrobenzene (or nitrobenzene previously used in the operation) and'astream of dry chlorine gas is passed into the suspension at a temperature of 60215 C. "until the desired shade of color is secured, which can be determined by sampling and dyetesting. Tl'ie charge is then filtered. the nitrobenzene is removed by washing with alcohol, and the product is finished in the usual manner.

The lifl-lUl'lllQ content of the satisfactory products produced by this method varied from 14.22 to 24.11 per cent, depending; upon. the conditions employed. Lyeings from samples showing this Wide variation in chlorine content showed no difference on dyetesting in respect to shade or resistance to bleach.

m. imam of acetic acid and new ben2ene.()ne part of the anthraquinone azine is suspended in a mixture of equal parts of glacial acetic acid and nitrobenzene so that the ratio of solvent to dyestuif is 15:1. The solvent used may be fresh or solvent previously used in the operation. A stream of dry chlorine gas is passed into the suspension until the desired shade is secured, which can be determined by sampling and dyctcsting. Washed with hot glacial acetic acid and finally with Water, dried, and-finished in the usual manner.

This method has been employed with entirely satisfactory results. A temperature of 85 C. was used and the resulting product showed a chlorine content of about 17.0%. In the laboratory the temperature has been varied from 40'115 C. with equally satisfactory results ahd the chlorine content has varied from 13.28 to 22.26 per cent with no dillerence in dyetests.

The vat dyestuil produced in the manner above-described possesses great ti'nctorial value and yields dyeings of a clear 'grccnishblue shade which are faster to chlorine than The charge is then filtered;

mama

those produced by chlorinatedi derivatives of the aforesaid azinc when the: chlorination is carried out in accordance with the heretofore known processes.

I claims 1. The r'i'; s of making a cblcro-detivative of -d1hydro-l,2,1',2-anthraquinoncazine which comprises passing iry chlorine gas into a suspension of said azine m a liquid comprisin acetic acid.

2. The rooeas oi mak' a chicrc-dci-ivat-ive of iihydr o-1,2,1 -anthraquincnc aziue which comprises hosting said czinc with freechloriiw in the pz'cscnce of acetic acid.

3. The process of making a chioroderii'a tive of N- iihydro-1,2,1',2-anthraquinonoazine which comprises heating said azine with free chiorina'in the presence of giccicl acetic acid.

4. Tha process of making a chicrcflicxva- 40 M16 115 C. until said azine is converted into a poiy-chloro-(ierivctivc.

6. The'grocess of making a chime-derivative of -dihydm-LQJ,2-anthraquinoneazine which comprises cssing dry chlosine gas into a suspension of said azine in a mixture of acetic acid and an inert organic ii uii The process of making a chicroderiva tive of, Ndihydio-i,2,1',2'-anthmqui11oncazine which comprises passing dry chlorine gas into a suspension of said azirie in a mixture of acetic acid and nitrobenzcns.

The process of making a, chlorc -deriva tive of ffldihydm-LQA',2-acthraquinonciiZiIlC which comprises heating said azine with chlorine in the presence of a mixture of about cqcsi parts of acetic acid and nitrobcnzczic.

9. The imo-cw oi: making a. (micro-derivative. of fi'riiihycho-l,2,1',2-anthmquinoneazinc which comprises heating said axin with chlorine iii the prcscncc of a mixture of glacial acetic acid and nitrobenzom.

10. The process of making a chloro-iici-ivativ'e of ILdihydrod3,1,2-m1t.i1raquinoxiemine which comprises limiting szzicl azinc wit!"- 'we in he pxrcsencc of 2. mixture of acid and nitrobonzezis cizi temabout 50 and 115" C.

in tesiimcziy whereof I aiiix my signature.

QAKLEY M. BESHOP, 

